Haier AC122ACERA [370/408] Troubleshooting

Haier AU362AIEAA [370/408] Troubleshooting
yes
no
check if discharging temp.
sensor value is normal
check if refrigerant is too
much or too less
check if the system
piping is blocked
adjust refrigerant
yes
outdoor indicator LED2 flashes 4 times
replace sensor
yes
replace PCB
no
yes
Alarm condition: outdoor DC motor is blocked rotor or broken, abnormal.
outdoor indicator LED2 flashes 2 times
3) Outdoor DC motor abnormal
adjust fan blade to
make it run normally
adjust lead wire
of fan motor
yes
no
Check if the lead wire of DC motor
is broken or short-connected
Check if the outdoor unit fan
blade is blocked by some objects
Replace motor
Warning: For outdoor DC fan motor, forbidden to pull off the plug when
being electrified.
4) Communication error between indoor and outdoor units
outdoor indicator LED2 flashes 3 times
yes
check if the failure
is eliminated
yes
compressor can not startup after
unit is switched on for 4 minutes
no
check if wiring between indoor
and outdoor is correct, power
supply is 50Hz
if indoor unit alarms other
failure codes
check the 4th bit of SW5 on
PCB is at "OFF", the others
are at "ON"
yes
eliminate other
faults
adjust wiring and
power supply,
note not connect
L/N wrong
Replace outdoor
PCB
no
no
adjust the
position
yes
Replace indoor
PCB
5) Compressor discharging temperature protection
outdoor indicator LED2 flashes 4 times
Alarm condition: Within one hour after compressor is running, compressor
discharging temperature is over 120degree for 3 times continously.
adjust piping
no
no
Troubleshooting
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